/*
 *
 * Copyright (c) 2008, All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Portions of the code may be copied from Google Collections
 * or Apache Commons projects.
 */

package com.coury.dasle.parser.states;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

import com.coury.dasle.helper.ParseHelper;
import com.coury.dasle.parser.LineParser;
import com.coury.dasle.parser.Parser;

public class ParseClassNameState implements State, MatchCallback {
	private Class<? extends Parser> parserClass;

	public State execute(LineParser parserHolder, Class<? extends Parser> parserClass) throws IllegalArgumentException, InstantiationException, IllegalAccessException, InvocationTargetException {
		this.parserClass = parserClass;
		
		if (ParseHelper.tryToMatch(parserHolder, parserClass.getSimpleName(), this)) {
			return new ParseParametersState();
		}
		
		return null;
	}
	
	public boolean matched(LineParser parserHolder) throws IllegalArgumentException, InstantiationException, IllegalAccessException, InvocationTargetException {
		@SuppressWarnings("unchecked")
		Constructor<? extends Parser>[] constructors = (Constructor<? extends Parser>[]) parserClass.getConstructors();
		if (constructors.length > 1) {
			throw new IllegalArgumentException("Cannot handle more than one constructor for parser yet");
		}
		
		Constructor<? extends Parser> constructor = constructors[0];
		Class<?>[] parameters = constructor.getParameterTypes();
		
		Object[] values = new Object[parameters.length];
		 
		int n = 0;
		for (Class<?> paramClass : parameters) {
			String innerPart = parserHolder.next();
			values[n++] = paramClass.cast(innerPart);
		}
		
		parserHolder.setParser(constructor.newInstance(values));
		return true;
	}

}
